packages/shared/lib/keys/keypacket.ts

   1 import type { PrivateKeyReference, PublicKeyReference, SessionKey } from '@proton/crypto';
   2 import { CryptoProxy } from '@proton/crypto';
   3 import { uint8ArrayToBase64String } from '@proton/shared/lib/helpers/encoding';
   4
   5 export const decryptKeyPacket = async ({
   6     armoredMessage,
   7     decryptionKeys,
   8 }: {
   9     armoredMessage?: string;
  10     decryptionKeys: PrivateKeyReference[];
  11 }) => {
  12     const sessionKey = await CryptoProxy.decryptSessionKey({
  13         armoredMessage,
  14         decryptionKeys,
  15     });
  16     if (!sessionKey) {
  17         throw new Error('Missing session key');
  18     }
  19     const message = await CryptoProxy.decryptMessage({
  20         armoredMessage,
  21         sessionKeys: sessionKey,
  22         format: 'binary',
  23     });
  24     return { message, sessionKey };
  25 };
  26
  27 export const encryptAndSignKeyPacket = async ({
  28     binaryData,
  29     sessionKey,
  30     encryptionKey,
  31     signingKey,
  32     context,
  33 }: {
  34     sessionKey: SessionKey;
  35     binaryData: Uint8Array;
  36     encryptionKey: PublicKeyReference;
  37     signingKey: PrivateKeyReference;
  38     context?: Parameters<typeof CryptoProxy.signMessage<any>>[0]['context'];
  39 }) => {
  40     const result = await CryptoProxy.encryptSessionKey({
  41         ...sessionKey,
  42         encryptionKeys: [encryptionKey],
  43         format: 'binary',
  44     });
  45
  46     const signature = await CryptoProxy.signMessage({
  47         binaryData,
  48         signingKeys: [signingKey],
  49         detached: true,
  50         context,
  51     });
  52
  53     return {
  54         keyPacket: uint8ArrayToBase64String(result),
  55         signature,
  56     };
  57 };